Time:2020-03-04 16:03:57
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In 2009, the state had a new national standard for fire doors, dividing the fire prevention degree of fire doors into different levels. It is divided into Class A fire door, Class B fire door and Class C fire door.
Then why should steel fire doors be divided into these three grades? How is it divided? What is the difference between fire doors of different grades?
First, the division of fire doors
1. According to the fire resistance limit and heat insulation performance, Class A fire door shall not be less than 1.5 hours; Class B fire doors shall not be less than 1.0 hours; Class C fire door shall not be less than 0.5 hours. We can choose according to different needs, but now Class A and Class B fire doors are widely used.
2. According to the material classification of fire doors: there are many kinds of fire doors, and the materials used are widely stainless steel fire doors, glass fire doors, steel fire doors, etc.
Second, the difference between class a fire door and class b fire door
1. Material Difference: Different fire prevention materials, the material difference lies in the thickness of the built-in fire prevention rock wool board inside, the thickness of rock wool board for Class A fire doors is 52mm, and the thickness of rock wool board for Class B fire doors is 46 mm. As a result, Class A fire doors have longer fire prevention time than Class B fire doors, and the fire prevention performance of Class A fire doors is better.
2. Difference of uses: Class A fire doors are generally used in important fire exits such as machine rooms, warehouses, oil depots and flammable and explosive public places, while Class B fire doors are generally used in more common fire exits such as some common buildings. The use of Class B fire doors is wider than that of Class A fire doors.
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